q 15 / 2 − 4 q 13 / 2 + 8 q 11 / 2 − 13 q 9 / 2 + 17 q 7 / 2 − 20 q 5 / 2 + 19 q 3 / 2 − 17 q + 12 q − 7 q 3 / 2 + 3 q 5 / 2 − 1 q 7 / 2 {\displaystyle q^{15/2}-4q^{13/2}+8q^{11/2}-13q^{9/2}+17q^{7/2}-20q^{5/2}+19q^{3/2}-17{\sqrt {q}}+{\frac {12}{\sqrt {q}}}-{\frac {7}{q^{3/2}}}+{\frac {3}{q^{5/2}}}-{\frac {1}{q^{7/2}}}}
